US12024984B2 - System and method for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization - Google Patents
System and method for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization Download PDFInfo
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- US12024984B2 US12024984B2 US18/016,674 US202218016674A US12024984B2 US 12024984 B2 US12024984 B2 US 12024984B2 US 202218016674 A US202218016674 A US 202218016674A US 12024984 B2 US12024984 B2 US 12024984B2
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- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 title claims abstract description 98
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- 239000007788 liquid Substances 0.000 title claims abstract description 27
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- 239000007789 gas Substances 0.000 claims abstract description 162
- 238000004519 manufacturing process Methods 0.000 claims abstract description 66
- 238000011084 recovery Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 265
- 238000003860 storage Methods 0.000 claims description 57
- 239000013049 sediment Substances 0.000 claims description 36
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 34
- 238000000354 decomposition reaction Methods 0.000 claims description 33
- 238000000926 separation method Methods 0.000 claims description 33
- 239000007791 liquid phase Substances 0.000 claims description 25
- 239000003345 natural gas Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 16
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- 238000001914 filtration Methods 0.000 claims description 15
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/34—Arrangements for separating materials produced by the well
- E21B43/38—Arrangements for separating materials produced by the well in the well
- E21B43/385—Arrangements for separating materials produced by the well in the well by reinjecting the separated materials into an earth formation in the same well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Definitions
- the present invention relates to the field of natural gas hydrate exploitation, and in particular to a system and method for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization.
- Natural gas hydrate is regarded as the most potential new clean energy for replacing the traditional fossil energy in the 21st century.
- the natural gas hydrate has advantages such as huge reserves, wide distribution, high energy density and clean combustion, and thus is attracting more and more attention around the world.
- China has successfully drilled core samples of natural gas hydrate in a permafrost region of Qinghai Republic on land and in the Shenhu area of the northern South China Sea, which proves that such clean energy is contained both on the land and in the sea area of China.
- the exploitation of natural gas hydrate includes three-phase (solid, liquid and gas) substances, and the exploitation process further includes phase change decomposition/reformation of hydrate. Since the phase change process is coupled with a fluid-solid-heat multi-physical field, the in-situ exploitation of natural gas hydrate is more complex than the traditional oil and gas exploitation.
- solid natural gas hydrate decomposes into gaseous natural gas and liquid-phase water by depressurization, and a cementing skeleton of sediment particles in the reservoir is weakened, resulting in the strength reduction of the hydrate reservoir (or even deformation of the reservoir) and sand production on the formation.
- the decomposed gas and water as well as moving sediment particles also reduce the porosity of the reservoir and decrease the permeability of the hydrate reservoir, thereby slowing down the decomposition of natural gas hydrate and lowering the efficiency of gas production.
- an object of the present invention is to provide a system and method for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization, so as to realize the comprehensive utilization and treatment of liquid-phase water produced by decomposition of a large amount of downhole hydrate, solve the problems of control of depletion and instability of the reservoir in a process of producing gas and water through hydrate decomposition, and finally achieve the object of safe and continuous depressurization-induced exploitation of the natural gas hydrate.
- the present invention adopts the following technical solutions.
- a casing configured to penetrate through a marine layer, an upper sediment covering layer, a natural gas hydrate reservoir and a lower sediment covering layer so as to form an exploitation well, wherein an upper end of the exploitation well is connected to a produced gas collection pipeline, and the produced gas collection pipeline is configured to be connected to a produced gas recovery system; a perforated channel is distributed in a section of the casing located in the natural gas hydrate reservoir; and a filtering device is arranged around the section of the casing located in the natural gas hydrate reservoir; and
- a tubular string component assembly is mounted in the exploitation well, and includes an outer string, a production tubular string and an auxiliary riser; a first check valve is mounted at the bottom of the outer string, a gas supply pipeline is connected into an upper portion of the outer string, and a flow controller is mounted in the gas supply pipeline to regulate the flow rate of gas entering the outer string; the production tubular string is mounted in the outer string, a space between the outer string and the production tubular string serves as a water storage chamber, and a second check valve is mounted at the bottom of the production tubular string; and the auxiliary riser is mounted in the production tubular string to discharge liquid-phase water.
- the system for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization includes a monitoring well that is independent of the exploitation well and configured to monitor a pressure change of the natural gas hydrate reservoir.
- the gas-water separation device is connected to the produced gas collection pipeline to convey the separated natural gas to the produced gas collection pipeline.
- a circulating valve is mounted in a pipeline connected to the gas-water separation device and the produced gas collection pipeline; and a gas flow detector is mounted in the produced gas collection pipeline.
- the filtering device is gravel; and a gravel settlement pit is arranged in the lower sediment covering layer through which the casing penetrates.
- a sand filtering device is arranged in the gravel settlement pit.
- a method for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization based on the above system.
- the method includes the following steps.
- step 1 a production casing penetrating through a marine layer, an upper sediment covering layer, a natural gas hydrate reservoir and a lower sediment covering layer is formed on a formation of a metallogenic region of natural gas hydrate to perform a well cementing operation; a drilling operation is performed and the perforated channels are arranged in a casing section of the natural gas hydrate reservoir, and gravel is packed around a wall of the casing in the natural gas hydrate reservoir; a gravel settlement pit is arranged in the lower sediment covering layer through which the casing penetrates; and a monitoring well is correspondingly arranged in the vicinity of a hydrate exploitation well to monitor a pressure change of the natural gas hydrate reservoir in real-time.
- step 2 a tubular string component assembly is dropped and mounted in a borehole of the exploitation well formed by the casing to carry out depressurized production according to the pressure of the natural gas hydrate reservoir, gas and water production behavior of hydrate pressurization-induced decomposition, and pressure conditions of gas and water in the exploitation well.
- step 3 the gas produced from hydrate depressurization-induced decomposition in the natural gas reservoir is recovered through a produced gas collection pipeline at an upper end of the casing exploitation well; and the produced water is regulated and controlled step by step according to the overall requirements of hydrate depressurized production, and then discharged to the outside through the casing exploitation well, a water storage chamber, an annular region in a production tubular string and an auxiliary riser, and finally separated by a gas-water separation device of an operation platform for recovery.
- step 2 includes:
- the produced gas gathered in the upper portion of the casing exploitation well flows to the outlet end through the produced gas collection pipeline connected to the exploitation well for measurement, collection and utilization according to the gas and water production condition of hydrate decomposition and the pressure change condition in the natural gas hydrate reservoir, and a first check valve at the bottom of the outer string and a second check valve at the bottom of the production tubular string are opened at proper time to regulate and control the liquid-phase water above the safe water level in the exploitation well step by step and discharge the liquid-phase water under the condition of satisfying safe and effective depressurized production, so as to form an downhole gas-liquid synergic depressurized exploitation operation among the natural gas hydrate reservoir, the casing exploitation well, the water storage chamber and the annular region in the production tubular string.
- the discharged produced gas is measured by a gas flow detector, and then enters a gas storage, or is stored through liquification, wherein a part of the gas enters the water storage chamber through a gas supply pipeline and a flow controller for pressurization and water discharge when there is a pressure compensation requirement for the water storage chamber; and the produced water discharged from the water storage chamber passes the gas-water separation device, one part of the water enters a water outlet pipeline for collection, and the other part of the water enters a water return pipeline, and is then heated by a heating device and returned to the water storage chamber.
- the present invention has the following beneficial effects.
- the present invention is characterized in that the depressurization-induced exploitation of natural gas hydrate resources is performed with a synergistic effect of downhole gas-liquid discharge, such that a scheme for treating the water produced by decomposition of natural gas hydrate is provided while avoiding the violent pressure fluctuation of the reservoir during exploitation, preventing the large-area depletion of the reservoir and maintaining the stability of the reservoir.
- the present invention has the following advantages.
- a conventional electric submersible pump for downhole water and gas pumping is omitted, thereby saving equipment costs and corresponding operation and maintenance costs.
- the gas separated from the gas-water separation device 15 flows into the produced gas collection pipeline 20 , and enters the gas flow detector 21 together with the produced gas naturally separated from the exploitation well 24 through the produced gas collection pipeline 20 for measurement and collection.
- the water which is discharged from the water storage chamber and produced by hydrate decomposition is recovered after gas-water separation treatment, wherein a part of the water is heated by the heating device and the hot water is returned to the water storage chamber to prevent the secondary reformation of the hydrate in the wellbore string and eliminate a risk of blockage.
- This embodiment provides a method for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization based on the system of embodiment 1. Specifically, the method includes the following steps.
- step 3 the gas produced from hydrate depressurization and decomposition in the natural gas reservoir is recovered through a produced gas collection pipeline at an upper end of the casing exploitation well; and the produced water is regulated and controlled step by step according to the overall requirements of hydrate depressurized production, and then discharged to an offshore operation platform through the casing exploitation well, a water storage chamber, a production tubular string component and an auxiliary riser, and finally recovered after passing a gas-water separation device.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211180387.4 | 2022-09-26 | ||
| CN202211180387.4A CN115506754A (zh) | 2022-09-26 | 2022-09-26 | 一种井下气液协同降压开采天然气水合物的系统及方法 |
| PCT/CN2022/126879 WO2023124449A1 (zh) | 2022-09-26 | 2022-10-24 | 一种井下气液协同降压开采天然气水合物的系统及方法 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| US20240183250A1 US20240183250A1 (en) | 2024-06-06 |
| US12024984B2 true US12024984B2 (en) | 2024-07-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US18/016,674 Active US12024984B2 (en) | 2022-09-26 | 2022-10-24 | System and method for exploiting natural gas hydrate with downhole gas-liquid synergic depressurization |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US12024984B2 (zh) |
| CN (1) | CN115506754A (zh) |
| WO (1) | WO2023124449A1 (zh) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0707699D0 (en) * | 2007-04-20 | 2007-05-30 | Columbus Oil And Gas Inc | Improvements relating to oil and gas production |
| RU2412337C1 (ru) * | 2009-12-23 | 2011-02-20 | Лимнологический институт Сибирского отделения Российской академии наук | Способ добычи газа из газовых гидратов донных отложений |
| CN102213090B (zh) * | 2011-06-03 | 2014-08-06 | 中国科学院广州能源研究所 | 冻土区天然气水合物开采方法及装置 |
| CN103867165B (zh) * | 2014-03-14 | 2016-04-13 | 大连理工大学 | 一种安全高效的海洋天然气水合物降压分解开采装置和方法 |
| CA2917316A1 (en) * | 2015-11-02 | 2017-05-02 | Bejing Testwell Technology Co. Ltd. | Coalbed methane drainage and recovery equipment |
| CN109915085B (zh) * | 2019-04-12 | 2021-01-29 | 吉林大学 | 一种基于气水平衡的天然气水合物开采方法 |
| CN112081559A (zh) * | 2019-06-13 | 2020-12-15 | 中石化石油工程技术服务有限公司 | 一种降压和双管注入改性流体开采天然气水合物的装置和方法 |
| CN114135252A (zh) * | 2021-12-07 | 2022-03-04 | 西南石油大学 | 一种双层管双梯度钻井隔离液的注入工艺 |
| CN114198066B (zh) * | 2021-12-16 | 2023-06-20 | 中国地质科学院勘探技术研究所 | 一种海洋天然气水合物除砂开采装置及其除砂开采方法 |
-
2022
- 2022-09-26 CN CN202211180387.4A patent/CN115506754A/zh active Pending
- 2022-10-24 WO PCT/CN2022/126879 patent/WO2023124449A1/zh active Application Filing
- 2022-10-24 US US18/016,674 patent/US12024984B2/en active Active
Non-Patent Citations (3)
| Title |
|---|
| English translation for CN 106837338 (Year: 2017). * |
| English translation for CN 106869871 (Year: 2019). * |
| English translation for CN 210919000 (Year: 2020). * |
Also Published As
| Publication number | Publication date |
|---|---|
| US20240183250A1 (en) | 2024-06-06 |
| CN115506754A (zh) | 2022-12-23 |
| WO2023124449A1 (zh) | 2023-07-06 |
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